scholarly journals Registro de daño de Aulacoscelis melanocera (Coleoptera: Orsodacnidae) sobre Cycas revoluta (Cycadaceae) en Campeche, México

2020 ◽  
Vol 46 (2) ◽  
pp. 1-4
Author(s):  
Saúl Sánchez-Soto
Keyword(s):  
Cycas Revoluta

El 7 de mayo de 2018, en el jardín de un sitio arqueológico en el norte de Campeche, México, se observó una planta de Cycas revoluta con aproximadamente el 40 % del follaje dañado por un enjambre de Aulacoscelis melanocera (Coleoptera: Orsodacnidae). El presente trabajo constituye el primer registro de esta especie ocasionando daño severo en C. revoluta y su primer registro para el estado de Campeche.

A Scanning Electron Microscope Study of Isolated Guard Cells

1973 ◽  
Vol 31 ◽  
pp. 454-455 ◽  
Author(s):  
P. Dayanandan ◽  
P. B. Kaufman
Keyword(s):  
Electron Microscope ◽  
Electron Microscope Study ◽  
Three Dimensional ◽  
Guard Cells ◽  
Scanning Electron Microscope Study ◽  
Psilotum Nudum ◽  
Subsidiary Cells ◽  
Welwitschia Mirabilis ◽  
Cycas Revoluta ◽  
Scanning Electron

A three dimensional appreciation of the guard cell morphology coupled with ultrastjuctural studies should lead to a better understanding of their still obscure dynamics of movement. We have found the SEM of great value not only in studies of the surface details of stomata but also in resolving the structures and relationships that exist between the guard and subsidiary cells. We now report the isolation and SEM studies of guard cells from nine genera of plants.Guard cells were isolated from the following plants: Psilotum nudum, four species of Equisetum, Cycas revoluta, Ceratozamia sp., Pinus sylvestris, Ephedra cochuma, Welwitschia mirabilis, Euphorbia tirucalli and Allium cepa.

scholarly journals Draft Genome Sequence of the Nitrogen-Fixing and Hormogonia-Inducing CyanobacteriumNostoc cycadaeStrain WK-1, Isolated from the Coralloid Roots ofCycas revoluta

2018 ◽  
Vol 6 (7) ◽  
Author(s):  
Yu Kanesaki ◽  
Masaki Hirose ◽  
Yuu Hirose ◽  
Takatomo Fujisawa ◽  
Yasukazu Nakamura ◽  
...  
Keyword(s):  
Host Plant ◽  
Genome Sequence ◽  
Draft Genome ◽  
Draft Genome Sequence ◽  
Whole Genome Sequence ◽  
Whole Genome ◽  
Nitrogen Fixing ◽  
Coralloid Roots ◽  
Cycas Revoluta

ABSTRACTWe report here the whole-genome sequence ofNostoc cycadaestrain WK-1, which was isolated from cyanobacterial colonies growing in the coralloid roots of the gymnospermCycas revoluta. It can provide valuable resources to study the mutualistic relationships and the syntrophic metabolisms between the cyanobacterial symbiont and the host plant,C. revoluta.

Effects of the Food Plant of California Red Scale, Aonidiella aurantii (Mask.) on Reproduction of its Hymenopterous Parasites

1957 ◽  
Vol 89 (5) ◽  
pp. 219-230 ◽  
Author(s):  
J. Morris Smith
Keyword(s):  
Biological Control ◽  
Insect Pests ◽  
Food Plant ◽  
Early Failure ◽  
Aonidiella Aurantii ◽  
Host Insect ◽  
Sago Palm ◽  
Long Period ◽  
Hymenopterous Parasite ◽  
Cycas Revoluta

Discrepancies in the degree of biological control of insect pests where the food plant species of the host were the only known variants in the environment have been subjects of scattered observations in the literature by Morgan (1910), Compere (1936), Gilmore (I938), and others.A long period of speculation on the existence of strains of California red scale, Aonidiella aurantii (Mask.) immune to attack by parasites culminated in the discovery by Flanders (1939a, 1942a) that the hymenopterous parasite Habrolepis rouxi comp. reproduced satisfactorily on A. aurantii on Citrus spp. but that verv few emerged from the same species of scale on sago palm, Cycas revoluta Thunb. This was considered to be the reason for Compere's early failure to bring the hymenopterous parasite, Comperiella bifasciata How, from the Orient to California on scale-infested sago palm; Smith (1942) concluded: “Recognition must be given to the possibility that the host plant may confer on the host insect a kind of immunity to parasitization”.

Cycas revoluta (sago cycad) exposures reported to Texas poison centers

2020 ◽  
Vol 38 (8) ◽  
pp. 1611-1615 ◽  
Author(s):  
Mathias B. Forrester ◽  
George M. Layton ◽  
Shawn M. Varney
Keyword(s):  
Poison Centers ◽  
Cycas Revoluta

Suspected cycad (Cycas revoluta) intoxication in dogs

1991 ◽  
Vol 62 (4) ◽  
pp. 189-190 ◽  
Author(s):  
C. J. Botha ◽  
T. W. Naudé ◽  
G. E. Swan ◽  
Marcella M. Ashton ◽  
J. F. Van der Wateren
Keyword(s):  
Elevated Serum ◽  
Alanine Transaminase ◽  
Chemical Investigation ◽  
Serum Concentrations ◽  
Mucous Membranes ◽  
Cycas Revoluta

Three dogs which ingested part of the stem of a Japanese cycad (Cycas revoluta) vomited repeatedly within hours after ingestion, showed marked depression, severely congested mucous membranes, increased thirst and profuse salivation. Subsequent haematological and blood chemical investigation revealed elevated serum concentrations of alanine transaminase, an initial mild lymphocytopenia, thrombocytopenia and a leucocytosis. The dogs recovered uneventfully.

scholarly journals Vertical Strata and Stem Carbon Dioxide Efflux in Cycas Trees

Plants ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 230 ◽  
Author(s):  
Thomas E. Marler ◽  
Murukesan V. Krishnapillai
Keyword(s):  
Carbon Dioxide ◽  
Carbon Cycling ◽  
Sap Flow ◽  
Quadratic Model ◽  
Maintenance Respiration ◽  
Stem Respiration ◽  
Ecosystem Carbon ◽  
Vertical Location ◽  
Carbon Dioxide Efflux ◽  
Cycas Revoluta

Stem respiration is influenced by the vertical location of tree stems, but the influence of vertical location on stem respiration in a representative cycad species has not been determined. We quantified the influence of vertical strata on stem carbon dioxide efflux (Es) for six arborescent Cycas L. species to characterize this component of stem respiration and ecosystem carbon cycling. The influence of strata on Es was remarkably consistent among the species, with a stable baseline flux characterizing the full mid-strata of the pachycaulous stems and an increase in Es at the lowest and highest strata. The mid-strata flux ranged from 1.8 μmol·m−2·s−1 for Cycas micronesica K.D. Hill to 3.5 μmol·m−2·s−1 for Cycas revoluta Thunb. For all species, Es increased about 30% at the lowest stratum and about 80% at the highest stratum. A significant quadratic model adequately described the Es patterns for all six species. The increase of Es at the lowest stratum was consistent with the influence of root-respired carbon dioxide entering the stem via sap flow, then contributing to Es via radial conductance to the stem surface. The substantial increase in Es at the highest stratum is likely a result of the growth and maintenance respiration of the massive cycad primary thickening meristem that constructs the unique pachycaulous cycad stem.

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